HID: logitech-hidpp: use RAP instead of FAP to get the protocol version
According to the logitech_hidpp_2.0_specification_draft_2012-06-04.pdf doc:
https://lekensteyn.nl/files/logitech/logitech_hidpp_2.0_specification_draft_2012-06-04.pdf
We should use a register-access-protocol request using the short input /
output report ids. This is necessary because 27MHz HID++ receivers have
a max-packetsize on their HIP++ endpoint of 8, so they cannot support
long reports. Using a feature-access-protocol request (which is always
long or very-long) with these will cause a timeout error, followed by
the hidpp driver treating the device as not being HID++ capable.
This commit fixes this by switching to using a rap request to get the
protocol version.
Besides being tested with a (046d:c517) 27MHz receiver with various
27MHz keyboards and mice, this has also been tested to not cause
regressions on a non-unifying dual-HID++ nano receiver (046d:c534) with
k270 and m185 HID++-2.0 devices connected and on a unifying/dj receiver
(046d:c52b) with a HID++-2.0 Logitech Rechargeable Touchpad T650.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
diff --git a/drivers/hid/hid-logitech-hidpp.c b/drivers/hid/hid-logitech-hidpp.c
index b0da186..2434260 100644
--- a/drivers/hid/hid-logitech-hidpp.c
+++ b/drivers/hid/hid-logitech-hidpp.c
@@ -837,13 +837,16 @@
static int hidpp_root_get_protocol_version(struct hidpp_device *hidpp)
{
+ const u8 ping_byte = 0x5a;
+ u8 ping_data[3] = { 0, 0, ping_byte };
struct hidpp_report response;
int ret;
- ret = hidpp_send_fap_command_sync(hidpp,
+ ret = hidpp_send_rap_command_sync(hidpp,
+ REPORT_ID_HIDPP_SHORT,
HIDPP_PAGE_ROOT_IDX,
CMD_ROOT_GET_PROTOCOL_VERSION,
- NULL, 0, &response);
+ ping_data, sizeof(ping_data), &response);
if (ret == HIDPP_ERROR_INVALID_SUBID) {
hidpp->protocol_major = 1;
@@ -863,8 +866,14 @@
if (ret)
return ret;
- hidpp->protocol_major = response.fap.params[0];
- hidpp->protocol_minor = response.fap.params[1];
+ if (response.rap.params[2] != ping_byte) {
+ hid_err(hidpp->hid_dev, "%s: ping mismatch 0x%02x != 0x%02x\n",
+ __func__, response.rap.params[2], ping_byte);
+ return -EPROTO;
+ }
+
+ hidpp->protocol_major = response.rap.params[0];
+ hidpp->protocol_minor = response.rap.params[1];
print_version:
hid_info(hidpp->hid_dev, "HID++ %u.%u device connected.\n",
